[CRYPTO] templates: Pass type/mask when creating instances

This patch passes the type/mask along when constructing instances of
templates.  This is in preparation for templates that may support
multiple types of instances depending on what is requested.  For example,
the planned software async crypto driver will use this construct.

For the moment this allows us to check whether the instance constructed
is of the correct type and avoid returning success if the type does not
match.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 36 insertions, 6 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index f7d2185..491205e 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -425,15 +425,45 @@ int crypto_unregister_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 
-struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,
-				       u32 type, u32 mask)
+struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
 {
-	struct rtattr *rta = param;
+	struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
+	struct crypto_attr_type *algt;
+
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*algt))
+		return ERR_PTR(-EINVAL);
+
+	algt = RTA_DATA(rta);
+
+	return algt;
+}
+EXPORT_SYMBOL_GPL(crypto_get_attr_type);
+
+int crypto_check_attr_type(struct rtattr **tb, u32 type)
+{
+	struct crypto_attr_type *algt;
+
+	algt = crypto_get_attr_type(tb);
+	if (IS_ERR(algt))
+		return PTR_ERR(algt);
+
+	if ((algt->type ^ type) & algt->mask)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_check_attr_type);
+
+struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
+{
+	struct rtattr *rta = tb[CRYPTOA_ALG - 1];
 	struct crypto_attr_alg *alga;
 
-	if (!RTA_OK(rta, len))
-		return ERR_PTR(-EBADR);
-	if (rta->rta_type != CRYPTOA_ALG || RTA_PAYLOAD(rta) < sizeof(*alga))
+	if (!rta)
+		return ERR_PTR(-ENOENT);
+	if (RTA_PAYLOAD(rta) < sizeof(*alga))
 		return ERR_PTR(-EINVAL);
 
 	alga = RTA_DATA(rta);